In the past few years, YouTube and other sites for sharing video files over the Internet have vaulted from obscurity to places of centrality in the media landscape. The files available at YouTube include a mix of user-generated video and clips from network television shows. Networks fear that availability of their clips on YouTube will depress television viewing. But unauthorized clips are also...

OBJECTIVES To test whether increased television viewing is associated with increased total energy intake and with increased consumption of foods commonly advertised on television, and to test whether increased consumption of these foods mediates the relationship between television viewing and total energy intake. DESIGN Prospective observational study with baseline (fall 1995) and follow-up (...

Factors affecting the two-stage equilibration rebreathing procedure for the measurement of mixed venous Pco2 are discussed. The most important practical conclusion is that the volume of gas in the bag should not be more than twice the tidal volume; but the exact ratio is not critical. Suitable equipment is described. Practical problems and variations in technique are described in detail. We are...

OBJECTIVE We examined whether the negative relation between television viewing that exceeds the recommendations of the American Academy of Pediatrics (AAP) and school readiness varied by family income. METHODS Data were collected from 807 children from diverse backgrounds. Parents reported hours of television viewing, as well as family income. Children were assessed using measures of math, kn...

BACKGROUND Although research has suggested that extensive television viewing may be associated with sleep problems, the direction of this association has not yet been determined. OBJECTIVE To investigate directional hypotheses regarding the association between television viewing and sleep problems during adolescence and early adulthood. DESIGN The Children in the Community Study, a prospect...

OBJECTIVE The goal was to examine the longitudinal associations of changes in television viewing and other sources of sedentary behavior with changes in leisure-time moderate/vigorous physical activity in adolescence. METHODS We studied a cohort of 6369 girls and 4487 boys who were 10 to 15 years of age in 1997. During each of 4 years of follow-up assessments, participants self-reported their...

Much attention has been paid to the amount of time Americans spend watching television. Cultivation theory has been important in exploring behavioral effects of television viewing for many years. However, psychosocial health has received much less scrutiny in relation to television viewing time. This investigation examined the hypotheses that television-free individuals and viewers adhering to ...

BACKGROUND Television viewing is a highly prevalent sedentary behavior among older adults, yet the mortality risks associated with hours of daily viewing over many years and whether increasing or decreasing viewing time affects mortality is unclear. This study examined: 1) the long-term association between mortality and daily viewing time; 2) the influence of reducing and increasing in televisi...

OBJECTIVE To examine the independent and joint associations of diet quality and television viewing time with abnormal glucose metabolism (AGM) in men and women. METHOD Cross-sectional data from 5346 women and 4344 men from the 1999 to 2000 Australian Diabetes, Obesity and Lifestyle Study were examined. Diet quality scores were derived from a food frequency questionnaire and categorised into t...

CONTEXT There is controversy over whether childhood television viewing causes attention problems. The findings from cross-sectional and longitudinal studies have been mixed. To our knowledge, no longitudinal studies have assessed the impact of children's television viewing on attention problems in adolescence. The objective of this study was to assess this association. DESIGN, PARTICIPANTS, A...